Edit in JSFiddle

var scene = new THREE.Scene();

var camera = new THREE.PerspectiveCamera(90, window.innerWidth / window.innerHeight, 1, 5100);
scene.add(camera);

var front = getPlane(0xC986AF);
front.position.z = -250;
scene.add(front);

var back = getPlane(0xA75486);
back.rotation.y = THREE.Math.degToRad(180);
back.position.z = 250;
scene.add(back);

var right = getPlane(0x801D15);
right.rotation.y = THREE.Math.degToRad(-90);
right.position.x = 250;
scene.add(right);

var left = getPlane(0xD4726A);
left.rotation.y = THREE.Math.degToRad(90);
left.position.x = -250;
scene.add(left);

var top = getPlane(0xFFB4AA);
top.rotation.x = THREE.Math.degToRad(90);
top.position.y = 250;
scene.add(top);

var bottom = getPlane(0x550A00);
bottom.rotation.x = THREE.Math.degToRad(-90);
bottom.position.y = -250;
scene.add(bottom);

var renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);
renderer.render(scene, camera);

function getPlane(color) {
    var geometry = new THREE.PlaneGeometry(500, 500);
    var material = new THREE.MeshBasicMaterial({
        'color': color
    });
    return new THREE.Mesh(geometry, material);
}

rotate();

function rotate() {
    camera.rotation.y += 0.005;
    renderer.render(scene, camera);
    requestAnimationFrame(rotate);
}